Doug Gillard comments on the track from Consequence of Sound's Track By Track feature:
The album ends with epic prog. "Sons of the Beard" is a biker's nest of a tale. Its a very dynamic multipart song, it was great fun to play synth & strings on this one. Mark Shue plays a great bass melody at the end, and the behind-bridge strums return to fade you out of the record.
CoS article link: https://consequenceofsound.net/2019/10/guided-by-voices-track-by-track-sweating-the-plague-stream/